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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 121 to 130 of 28666 (0.039 seconds)| 121 |
Performance-preserving controller approximationGoddard, Philip John January 1995 (has links)
No description available.
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The Nature of Dust-Obscured Galaxies at z~2Bussmann, Robert Shane January 2010 (has links)
I use observational evidence to examine the nature and role in galaxy evolution of a population of dust-obscured galaxies (DOGs) at z ∼ 2. These objects are selected with the Spitzer Space Telescope, are bright in the mid-infrared (mid-IR) but faint in the optical, and contribute a significant fraction of the luminosity density in the universe at z ∼ 2. The first component of my thesis is a morphological study using high spatial resolution imaging with the Hubble Space Telescope of two samples of DOGs. One set of 33 DOGs have mid-IR spectral features typical of an obscured active galactic nucleus (AGN) (called power-law DOGs), while the other set of 20 DOGs have a local maximum in their spectral energy distribution (SED) at rest-frame 1.6μm associated with stellar emission (called bump DOGs). The host galaxy dominates the light profile in all but two of these DOGs. In addition, bump DOGs are larger than power-law DOGs and exhibit more diffuse and irregular morphologies; these trends are consistent with expectations from simulations of major mergers in which bump DOGs evolve into power-law DOGs. The second component of my thesis is a study of the dust properties of DOGs, using sub-mm imaging of 12 power-law DOGs. These power-law DOGs are hyper- luminous (2 × 10¹³ L⊙) and have predominantly warm dust (T(dust) > 35 - 60 K). These results are consistent with an evolutionary sequence in which power-law DOGs represent a brief but important phase when AGN feedback heats the interstellar medium and quenches star-formation. The third component of my thesis is a study of the stellar masses and star- formation histories of DOGs, using stellar population synthesis models and broad- band photometry in the rest-frame ultra-violet, optical, and near-IR. The best-fit quantities indicate bump DOGs are less massive than power-law DOGs. The relatively low stellar masses found from this line of analysis favor a merger-driven origin for ULIRGs at z ∼ 2.
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High Blood PressureMisner, Scottie 09 1900 (has links)
3 pp. / Revised
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An experimental test of nuclear models at the N=Z line in the A7̃0 regionKelsall, Nigel S. January 2002 (has links)
No description available.
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An application of simulation and embedded real time channel evaluation to HF communicationsDawson, J. F. January 1988 (has links)
No description available.
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An investigation of the factors affecting pressure resistance of Staphylococcus aureus and spores of Bacillus speciesChugtai, Afsha January 2002 (has links)
No description available.
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The pulmonary circulation at high altitudeWilliams, David Reid January 1989 (has links)
No description available.
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| 128 |
The effect of superplasticising admixtures on the performance of ciment fonduGill, Susan Margaret January 1987 (has links)
No description available.
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| 129 |
Remote monitoring of power system conductor voltagesGerrard, Carl Andrew January 1996 (has links)
No description available.
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| 130 |
Study of octupole-deformed K=1/2 bands in ²²â·ThHammond, Neil January 2002 (has links)
No description available.
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